The blower fan on my 98 in sig below started acting up a few weeks ago. More times than not, when i crank her up, the fan won't blow out of any vents and I can't hear the fan operating, regardless of which vent is selected or which fan speed is selected. Funny thing is, it is intermittent.

At first I thought maybe the blend doors weren't working, but when the fan ain't blowing, I can hear the blend door opening/closing as I switch between top vents, floor vents, and defrost. Plus, when driving down the road at highway speeds, I can feel the weak ram air flowing through which ever vents I have selected. Change the vent selection and the ram air will follow.

After letting the engine warm up and driving for a few miles, all of a sudden the fan kicks in and everything is normal, even when switching through all fan speeds. After I shutdown and immediately restart with a warm engine, it will sometimes do the same thing.

Anyone else ever have this issue? I was thinking possibly a weak relay or weak resistors, as it only does this intermittently, but more times than not. And with the cold weather like it is, this issue really blows...(pun intended).

Replaced it, that was the problem. Just in time for the Arctic blast that came through yesterday. Thanks again!
Amazing how much dirt, dust and pine needles can accumulate inside. I pulled the fan motor, cleaned the squirrel cage and vacuumed out the inside.